DR. W. GEOFFREY DUFFIELD ON THE 



Displacement -Wave-lengtK Diagram 



Abscissas - Pressures 



Displacement 



Square of Wave-length 



20 



6O SO IOO ISO 



Pressures in Atmospheres . 



Displacement -Wave-length Diagram 



Abscissae - Pressures 



Pressures in Atmospheres 



ZOO 



